您可以告诉redis在内存已满时要遵守的不同行为。

# volatile-lru -> remove the key with an expire set using an LRU algorithm
# allkeys-lru -> remove any key accordingly to the LRU algorithm
# volatile-random -> remove a random key with an expire set
# allkeys->random -> remove a random key, any key
# volatile-ttl -> remove the key with the nearest expire time (minor TTL)
# noeviction -> don't expire at all, just return an error on write operations

默认是

# maxmemory-policy volatile-lru

也许最好的选择是’volatile-ttl’，并确保所有缓存都包括：expires_in选项。

我不是专家，也没有这样做。这只是基于我当前对Redis和Rails的理解。